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Finding the Fourth Proportional to 769.33, 1,061.58 and 520.99

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Solution

The fourth proportional to 769.33, 1,061.58 and 520.99 is: 718.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.33 : 1,061.58 = 520.99 : x
  2. Step 2: Convert to fraction form
    769.33/1,061.58 = 520.99/x
  3. Step 3: Cross multiply
    769.33x = 1,061.58 × 520.99
  4. Step 4: Simplify right side
    769.33x = 553,072.56
  5. Step 5: Solve for x
    x = 553,072.56/769.33
  6. Step 6: Final answer
    x = 718.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.